body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    display: grid;
    place-items: center;
}
.underline {
    border-bottom: #ff0000;
    cursor: pointer;
}
.captchaContainer {
    width: 200px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.captchaContainer img {
    width: 48px; /* 调整为统一的宽度 */
    height: 48px; /* 调整为统一的高度 */
    margin: 0 5px; /* 图片之间的间距 */
}

#userName_err {
    color : #ff0000;
}